Can I get some basic guidance on things to check when a migration from Girder 4 to 5 doesn't work?

I have a ccf where the variables created by a serial plugin (DenonReceiver.lua) won't display when Girder 5 is used.

I don't see the DenonReceiver.lua in the Component Manager?
Is that my problem?
How do I get it to show up?

Thanks

Dudley